Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e0e7105e87d572…

MALICIOUS

PDF

71.9 KB Created: 2021-03-12 11:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 098c8032a10128f2e62ea374407e9ca2 SHA-1: cf80591796d8adb3d3526fdba33643cd8b937a65 SHA-256: 42e0e7105e87d5724d03bb0d4019b22bf4afcb846faf36d6aed24a00cc0c55cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to host malicious content or improve SEO for malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/123?utm_term=phases+of+the+moon+4th+grade+worksheet PDF link annotation
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/3026597.pdfIn PDF document text
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/jedanawigifababav.pdfIn PDF document text
    • http://vewisono.iblogger.org/23797816620.pdfIn PDF document text
    • http://subumobo.22web.org/plate_tectonics_worksheet_4th_grade.pdfIn PDF document text
    • http://vofovadero.22web.org/82315302879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/jatilifajukejin.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_d4fc7e3774a24b72983244453e8d6417.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/big_fish_book_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/amanush_2010_bengali_full_movie.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_96a2196b04054b3aa5dd65b94135cebb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/acer_aspire_5349_network_controller_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/durham_public_schools_personnel_report_2019.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_d9371156ef414f9988134a6099d47ec4.pdf?index=trueIn PDF document text
    • http://kivaxabobusited.epizy.com/suserixodugodexene.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_f3a40b4d98ff441795ee1ee00fa7d902.pdf?index=trueIn PDF document text
    • http://moduvovujirupe.rf.gd/acordes_de_titanic_en_flauta.pdfIn PDF document text
    • http://padanejelupe.rf.gd/bolojizuxuwixevoxareki.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/10105142508.pdfIn PDF document text
    • http://xafekejo.epizy.com/lexique_technique_anglais_franais.pdfIn PDF document text
    • http://xonotexeg.epizy.com/traxxas_summit_1_16_brushed_top_speed.pdfIn PDF document text
    • http://duguzowosuli.epizy.com/62591305619.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_b54cb27c0d604270845e300c39d51733.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xipavir/lozekejo.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/river_flows_in_you_piano_yiruma_original.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 5532 bytes
SHA-256: 5a381ccb70c460431e3907bfd75314f5bec6b02a0e40ff9a068888fb551c6d98
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10576 bytes
SHA-256: 7406d20bc2ce9d98eeb5dba2863959e845b48451872a7c7ae127f957c6ecc802

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